Dipper tooth and front for excavating dippers



Feb. 26, 1935. 1'. c. WH-ISLER 9 5 DIPPER TOOTH AND i'non'r FOR nxczwmme nrrrmns Filed Feb. 12, 1934 Patented Feb. 26, 1935 PATENT OFFICE DIPPER TOOTH AND FRONT FOR EXCAVATING DIPPERS Thomas C. Whisler, Berkeley, Calif., assignor to American Manganese Steel Company, Chicago Heights, 111., a corporation of Maine Application February 1.2., 1934, Serial No. 710,773

8 Claims.

This invention relates to improvements in' replaceable dipper teeth for excavating dippers and more particularly to the manner in which the dipper teeth are supported upon the digging lip of the dipper front.

Dipper teeth and particularly dipper teeth,

tudinally into seated position with respect to thelip of the dipper front,.wall. The bolts are subject to breaking or stretching either due to overstrain or the use of defective steel. It is also diflicult to properly tighten the bolts without the use of special wrenches. The nuts, of course, may come loose from the bolts and drop off unless there is frequent inspection. Changing of a tooth is a relatively slow job when bolts and nuts are employed.

On the other hand the use of ordinary wedge keys provides for drawing the tooth upon its support but the ordinary wedge keys do not function to tightly clamp the shanks of the tooth against the front wall support.

It is anobject of the present invention to disclose a construction according to which the dipper tooth is secured by means which acts to simultaneously draw the tooth longitudinally upon its support and to clamp the shanks against the support.

It is further an object of my invention to secure the dipper tooth to the support by the use of a clamp provided with wedge surfaces and a key for wedging the clamp into position.

The invention will be more readily understood from the following description of the specific embodiment disclosed in the attached drawing, in which Figure 1 is a plan view of a dipper tooth and the securing means therefor, a portion of the tooth being shown in section;

Figure 2 is a side elevation partially in vertical section;

Figure 3 is a detail section on the plane indicated 3-3 in Figure 2;

Figure 4 is a detail section on the plane indicated 4-4 in Figure 2, and

Figure 5 is a detail section on the plane indicated 55 in Figure 2.

A portion of the dipper front wall is indicated at 10, having a digging lip 12. It will be noted that in this design the lip 12 is not provided with slots as has been customary practice. The dipper tooth 14 is shown in this instance to include a replaceable and reversible base 16 and a replaceable and reversible tip or point 18. The point 18 is formed with divergent wings 20 adapted to fit over the tapered nose 22 of the tooth base. The point 18 has side shanks or cheeks 24 fitting into recesses 26 on the tooth base and adapted to be secured by a wedge key 28 which is fixed in position by the nut 30.

The tooth base includes rearwardly directed shank or jaw portions 32 which receive and emas brace the lip 12 of the dipper front wall 10. The dipper front wall may be formed with enlarged seat portions 34 as indicated in Figures 3 and 4.

On the inner side of the front wall ribs 36 may m be provided, which serve to hold the toothagainst lateral displacement. The dipper front wallv 13 is formed with an opening 38 adapted to cooperate with enlarged openings 40 formed in the dipper tooth shanks 32, as will be later described.

The exterior faces of the shanks 32 are recessed adjacent the openings 40 as shown at 42. The rear end of the shanks 32 are formed with wedge surfaces 44 adapted to be engaged by the wedge portions 46 at the ends of a C-shaped clamping member 48. As shown in Figure 2 the clamping member 48 may be passed through the openings 38 and '40 and brought into the position shown in which the end portions 46 hook rearwardly over the ends of the dipper tooth shanks 32. The C-shaped clamp 48 is fixed in position by driving in a wedge-shaped key 50 which acts to force the clamp 48 rearwardly and therefore to draw the tooth longitudinally upon the front 40 wall 10 and simultaneously, due to the wedging cooperation .between the C-clamp 48 and the ends of the shanks-32, the shanks 32 will be squeezed tightly into contact with the outer faces of the seats 34 formed on the front wall 10. By 45 might produce displacement and dislodgment 5 of the locking members.

It has heretofore been common practice to employ a. short vertical web between the divergent wings or shanks of a dipper tooth base but I do not employ such a web since, by my design, the w shanks may be forced to a tight seatagainst the surfaces of the front wall all the way from the lip edge to the rear ends of the shanks. If a vertical type web were presentv in the tooth between the wings or shanks, this tight fit could not be obtained. The construction disclosed is one that is relatively easy to assemble or disassemble since it is only necessary to place the tooth in position, insert the c clamp 48 and drive in the locking key 50 in order to obtain a tight and secure attachment of the tooth to the base.

I claim:

1. In a digging tooth construction, a tooth receiving base, a bifurcated tooth member having jaws seating on oppositely presented faces of said base, said jaws being formed with oppositely disposed longitudinally inclined outer faces and locking means comprising a C-clamp and a wedge pin, both extending through the jaws and the intervening base, said C-clamp having jaws engaging the outer inclined faces of the tooth jaws and said wedge pin forcing said C-clamp in a direction to draw the tooth jaws together upon the base.

2. A tooth construction as described in claim 1 in which the oppositely presented faces of the base are formed with ribs to prevent lateral displacement of the tooth base.

3. A tooth construction as described in claim 1 in which the toothijaws have oppositely disposed recesses that receive and protect the ends of the c-clamp and wedge pin against lateral displacement and shocks.

4. In combination a dipper front wall and a bifurcated dipper tooth having rearwardly extending jaws, a clamping member extending through said jaws and said front wall, said clamping member having hooked ends to receive and embrace end portions of said jaws and a locking wedge key for holding said clamping member in position and for securing said tooth upon said front wall. 7

5. In combination a dipper front wall and a bifurcated dipper tooth including rearwardly extending jaws adapted to receive and embrace said dipper front wall, said jaws and said front wall having cooperating openings, means adapted to be positioned in said openings to simultaneously draw said tooth longitudinally into position upon said front wall and to clamp said jaws against said front wall including a clamping member and a locking key.

8. In combination a dipper front wall and a bifurcated dipper tooth including rearwardly extending jaws adapted to receive and embrace said dipper front wall, said jaws and said front wall having cooperating openings, means adapted to be positioned in said openings to simultaneously draw said tooth longitudinally into' position upon said front wall and to clamp said jaws against said front wall, said means including a G-shaped clamping member having wedgeshaped ends cooperating with wedge surfaces on said jaws and a locking key for forcing said clamping member into position.

7. In combination, a dipper front wall having enlarged dipper tooth seat portions and a bifurcated dipper tooth having rearwardly extending jaws adapted to receive and embrace said seat portions on said front wall, said jaws and said front wall having cooperating openings, the ends of said jaws adjacent said openings having rearwardly directed and outwardly inclined web surfaces, a c-shaped clamping member adapted to be inserted through said openings, said clamping member having wedge-shaped ends for engagement with the wedge surfaces on said jaws and means for forcing said clamping member rearwardly with respect to said front wall to move said jaws into tightly clamped relation with the seating faces on said front wall.

8. In combination, a dipper front wall having enlarged dipper tooth seat portions and a bifur-- cated dipper tooth having rearwardly extending jaws adapted to receive and embrace said seat portions on said front wall, said jaws and said front wall having cooperating openings, the ends of said jaws adjacent said openings having rearwardly directed and outwardly inclined web surfaces, a c-shaped clampingmember adapted to be inserted through said openings, said clamping member having wedge-shaped ends for engagement with the wedge surfaces on said jaws and means for forcing said clamping member rearwardly with respect to said front wall to move said jaws into tightly clamped relation with the seating faces on said front wall, said means comprising a wedge key adapted to be inserted into the opening in said front wall forwardly with respect to said clamping member.

THOMAS C. WHISLER. 

